Isolating parts of a mixdown

[tarpley_jim]

I was wondering it's possible to isolate parts of a finished song. I'm looking to do some sort of a remix, including parts of different songs together (such as the vocals of one song layed over another's music). Does anyone know how to do this and can help me learn how to?

 

[TimOBrien]

Gets asked weekly.

Cant be done unless you can get the original separate tracks.
You cant separate the sugar from the cake once it's baked.

There are no magic buttons....